1 Preheat the oven to 325°F and grease 2 glass loaf pans. (If you don`t have glass loaf pans, line metal loaf pans with parchment to keep the blood sausage from reacting with the metal and creating an off-flavor.) Stir 1 teaspoon of salt into the blood. 2 Bring 2 1/2 cups water to a boil and stir in the oats. Simmer, stirring occasionally, for 15 minutes, until just tender, not mushy. 3 Pour the blood through a fine sieve into a large bowl to remove any lumps. Stir in the fat, onion, milk, pepper, allspice and remaining 1 1/2 teaspoons salt. Add the oatmeal and mix to combine. Divide the mixture between the loaf pans, cover with foil, and bake for 1 hour, until firm. Cool completely. Seal in plastic wrap and wither freeze for extended use or store in the refrigerator for up to a week. 4 To serve, cut a slice about 1/2-inch thick off the loaf. Fry in butter or oil until the edges are slightly crisped and browned.